New issue 3167: PyPy3 performance regression in string join https://bitbucket.org/pypy/pypy/issues/3167/pypy3-performance-regression-in-string
grambler1: Hello. I recently experienced a regression in performance between PyPy3 and PyPy2 in the string join method. The `testjoin.py` file is attached to the issue. In the following experiments `N = 10**5` ``` $ pypy3 testjoin.py Benchmark: Time (s) (200 iterations) ' '.join(map(str, range(N))) 1.4801070280000204 ' '.join(list(map(str, range(N)))) 0.7104864799998722 ' '.join(str(i) for i in range(N)) 1.5713386769998579 ' '.join([str(i) for i in range(N)]) 0.7061686919996646 ``` ``` pypy testjoin.py Benchmark: Time (s) (200 iterations) ' '.join(map(str, range(N))) 0.537734985352 ' '.join(map(str, xrange(N))) 0.670211076736 ' '.join(list(map(str, range(N)))) 0.549700975418 ' '.join(str(i) for i in range(N)) 1.45470499992 ' '.join([str(i) for i in range(N)]) 0.542479991913 ``` PyPy3 version: ```shell $ pypy3 --version Python 3.6.9 (7.3.0+dfsg-1~ppa1~ubuntu19.04, Dec 26 2019, 11:14:16) [PyPy 7.3.0 with GCC 8.3.0] ``` PyPy2 version: ```shell $ pypy --version Python 2.7.13 (7.3.0+dfsg-1~ppa1~ubuntu19.04, Dec 26 2019, 11:10:50) [PyPy 7.3.0 with GCC 8.3.0] ``` As indicated by the version information I ran the benchmarks on an Ubuntu system. Is this a known regression? _______________________________________________ pypy-issue mailing list pypy-issue@python.org https://mail.python.org/mailman/listinfo/pypy-issue
